Advice on tax implications re: house

We are selling our property out in the country and as we need to be closer to doctors and want to babysit the grandbabies.

We are planning on buying a house.

Here’s the situation: my daughter and son in law are living in a condo that will soon be too small for them. They will sell their condo but even with their equity in that sale may not be able to afford a house much bigger. They are kind of stuck in that condo for a few years.

Here’s what I’m thinking about:

Buy a house that is right where they’d like to live (good public schools). I’m 77 and have survived 3 cancers but still, I’m 77. Husband is 79 and has idiopathic pulmonary fibrosis. If one of us dies, the remaining parent moves into a smaller place or assisted living, and my daughter and her family move into our house.

What are the tax repercussions, how should this be handled to save on taxes.

Btw she is an only child, will inherit everything when we die, yes we have a will, estate plan (don’t know how to talk about it, I’m not a cpa).

Advice? Something I can read that informs me of our options? I haven’t asked our cpa, or estate attorney about this, I’d love to know what you tax nerds think!! Thank you guys in advance. I know this is a “first world problem” but we worked hard all of our lives, and they work hard too, and I’d like my grandchildren to go to good public schools.